issue doxygen#8731 grouping variables requires an empty line before closing @}

See to it that a comment block with `@}` is handled better after an inline comment.

Author: albert-github

src/commentcnv.l

@@ -388,6 +388,14 @@ SLASHopt [/]*
 <Scan>\n                           { /* new line */
                                      copyToOutput(yyscanner,yytext,yyleng);
                                    }
+<Scan>{CPPC}[!/]/.*\n[ \t]*{CPPC}[!/][ \t]*{CMD}"}" {
+				     yyextra->inSpecialComment=true;
+				     yyextra->blockHeadCol=yyextra->col+1;
+                                     yyextra->insertCppCommentMarker=true;
+  				     copyToOutput(yyscanner,yytext,yyleng);
+				     yyextra->readLineCtx=YY_START;
+				     BEGIN(ReadLine);
+                                   }
 <Scan>{CPPC}"!"/.*\n[ \t]*{CPPC}[\/!][^\/] | /* start C++ style special comment block */
 <Scan>({CPPC}"/"[/]*)/[^/].*\n[ \t]*{CPPC}[\/!][^\/] { /* start C++ style special comment block */
   				     if (yyextra->mlBrief)
@@ -436,14 +444,6 @@ SLASHopt [/]*
 				     yyextra->readLineCtx=YY_START;
 				     BEGIN(ReadLine);
                                    }
-<Scan>{CPPC}[!/]/.*\n              { /* one line special C++ comment */
-				     yyextra->inSpecialComment=true;
-				     yyextra->blockHeadCol=yyextra->col+1;
-                                     yyextra->insertCppCommentMarker=true;
-  				     copyToOutput(yyscanner,yytext,yyleng);
-				     yyextra->readLineCtx=YY_START;
-				     BEGIN(ReadLine);
-                                   }
 <Scan>{CPPC}/.*\n                  { /* one line normal C++ comment */
 				     yyextra->inSpecialComment=false;
   				     copyToOutput(yyscanner,yytext,yyleng);